Append version number to js/css URLs to force them to update

index.html

@@ -7,8 +7,8 @@
 <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js" crossorigin="anonymous"></script>
 <script src="//cdnjs.cloudflare.com/ajax/libs/marked/1.1.1/marked.min.js" crossorigin="anonymous"></script>
 <script src="//cdnjs.cloudflare.com/ajax/libs/sigma.js/1.2.1/sigma.min.js" crossorigin="anonymous"></script>
-<script type="text/javascript" src="script.js"></script>
-<link rel="stylesheet" type="text/css" href="style.css">
+<script type="text/javascript" src="script.js?v3.1"></script>
+<link rel="stylesheet" type="text/css" href="style.css?v3.1">
 <link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Lato:r,b,i">
 <link rel="icon" type="image/x-icon" href="favicon.ico">
 <link rel="manifest" href="manifest.json">